These servo clamp are made specifically for use on Large servos, as HITEC 5745, 5755, 5765 and similar
As can be seen the two guides fit inside the pockets tab of the servo, ensuring a superior fit and alignment, eliminating any movement.

FIT: HITEC large servos HS-5745MG , HS5755MG, HS5765MH and similar servos
For other servo brand/model , check the chart below for measure info.NOTE: you can use this servo clamp in combination with servo adapter LB-512 for LOSI 5ive-TBut not with LB- 519 adapter for Desert Buggy DBXL